Why is cvs done

If you decide to undergo CVS, your doctor will need to know your blood group and Rh status, so you may require a blood test beforehand. Chorionic villus sampling procedure The CVS procedure includes: You need to have a moderately full bladder.

You are dressed in a cotton hospital gown, and asked to lie on an examination table on your back. Sedative drugs such as nitrous oxide are available if you wish. Your baby is checked first via ultrasound scan. Your abdomen is swabbed with antiseptic solution. The site is injected with local anaesthetic. A slender needle, guided by ultrasound, is inserted through your abdomen wall until it reaches the edge of the placenta.

The needle is nowhere near the amniotic sac or the baby at any stage. This takes about two minutes or so. You may feel a strange dragging or drawing sensation in your pelvis or legs - this is normal, and no cause for alarm. It may be necessary to take a second sample. Once the sample is taken, the needles are removed. The baby is checked using the ultrasound scan. You are then free to get dressed.

Generally, you can expect to be at the clinic for up to 90 minutes. Immediately after chorionic villus sampling You may be asked to wait half an hour or so before leaving the clinic, just to make sure that both you and your baby are all right.

It may be best if someone else drives you home, especially if you were given drugs during the test. Be sure to discuss any concerns with your doctor prior to the procedure. Certain factors or conditions may interfere with CVS. These factors include, but are not limited to, the following:. The doctor will explain the procedure to you and offer you the opportunity to ask any questions that you might have about the procedure.

You will be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear. Generally, there is no special restriction on diet or activity prior to chorionic villus sampling. Tell your doctor if you are sensitive to or are allergic to any medications, latex, iodine, tape, and anesthetic agents local and general.

Tell your doctor of all medications prescribed and over-the-counter and herbal supplements that you are taking. Tell your doctor if you have a history of bleeding disorders or if you are taking any anticoagulant blood-thinning medications, aspirin, or any other medications that may affect blood clotting. It may be necessary for you to stop these medications prior to the procedure.

Tell your doctor if you are Rh negative. During the CVS procedure, blood cells from the mother and fetus can mix. This may lead to Rh sensitization and breaking down of fetal red blood cells. In most cases, prenatal blood tests will have determined whether you are Rh negative. You may be asked to provide these lab results before the procedure. You may or may not be asked to have a full bladder right before the procedure.

Depending on the position of the uterus and placenta, a full or empty bladder may help move the uterus into a better position for the procedure. A CVS procedure may be done on an outpatient basis, or as part of your stay in a hospital. An ultrasound will be performed to check the fetal heart rate, and the position of the placenta, fetus, and umbilical cord. Based on the location of the placenta, the CVS procedure will be performed through your cervix transcervical or through your abdominal wall transabdominal.

It's important to remember that you do not have to have CVS if it's offered. It's up to you to decide whether you want it. A midwife or doctor will speak to you about what the test involves, and let you know what the possible benefits are, to help you make a decision.

Find out more about why CVS is offered and deciding whether to have it. CVS is usually carried out between the 11th and 14th weeks of pregnancy, although it's sometimes performed later than this if necessary. The test itself takes about 10 minutes, although the whole consultation may take about 30 minutes. The CVS procedure is usually described as being uncomfortable rather than painful, although you may experience some cramps that are similar to period pains for a few hours afterwards.

Find out more about what happens during CVS. The first results of the test should be available within 3 working days and this will tell you if Down's syndrome, Edwards' syndrome or Patau's syndrome has been discovered. This is because a normal test result cannot exclude every possible genetic disorder.

You will then be able to discuss the implications fully. There is no cure for most chromosomal conditions. Therefore, you need to consider your options carefully. If you are considering termination, talk to your doctor or midwife. They can give you important information and advice and can refer you to a counsellor if you like.

Learn more here about the development and quality assurance of healthdirect content. InsideRadiology provides free and easily accessible, accurate, up to date and credible information about medical imaging tests and procedures.

Read more on InsideRadiology website. Congenital disorder, also known as congenital disease or birth defects, are conditions present from birth. Find out more about congenital disorders. A nuchal translucency scan is part of the ultrasound scan that may give an indication of chromosomal abnormality. Learn more about how and when it is performed. Down syndrome causes intellectual disability and other challenges. Early intervention can help children with Down syndrome reach their full potential.

Read more on raisingchildren. By week 12, your baby is the size of a plum but fully formed, with their organs, muscles, limbs and bones in place. At week 13 of pregnancy, you officially enter your second trimester and hopefully any morning sickness has eased off. The principle of screening is to offer a safe, accessible test to identify women with an increased chance of having a baby affected by a chromosomal or genetic condition.

A non-invasive prenatal test NIPT is a sensitive test to screen for Down syndrome and some other chromosomal disorders in the first trimester of pregnancy. Find out what being Rhesus D negative could mean for your baby and how it is treated. Pregnancy, Birth and Baby is not responsible for the content and advertising on the external website you are now entering. Video call.